Malicious PDF — malware analysis report

Static analysis result for SHA-256 470f33edd7e2b5fb…

MALICIOUS

PDF

84.8 KB Created: 2021-07-01 14:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3b330ddd6a47957e3204088881f62490 SHA-1: ee036f618f439388dfbb6bf8f08931d6efc4c6b7 SHA-256: 470f33edd7e2b5fbc8dba296ea9041dfd60e60a2287e2774800d2aeeae10987b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe652af50d---likole.pdf In PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/292329e3bf606a2fdd0617ee21aca8f3/41405328243.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/tmo8vpj0aaofvtrjb9chrlag7k/22343101428.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160dd9d527eace---bedeje.pdfIn PDF document text
    • http://svx.su/ffile/file/28238414749.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16097d1a3a425b---sawujorumafolib.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5875bb75f---xokotilefimoxupav.pdfIn PDF document text
    • http://gerocuki.hu/user/file/83099804625.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/1911e6e5728b478a9ffc058cbce53724/71029810203.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/jq82rercc6n83q56dp4ft7ef41/32501086193.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7175ac2b21---53473729944.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/fedareguxavewunux.pdfIn PDF document text
    • http://turatabor.hu/media/49189226651.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16070a2754f177---rikevesogazutiwovanoze.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/bowugaxijej.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/f3b487adaac2e382a7313f7cfbc95a46/71963793118.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc4cb357b0---60715645717.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/e0c42f1e5c4425959a5770df87832259/nuborojosimelonoxil.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/d4fe16cfd165ed3e9ec01c93cc920dfc/21019259689.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/u252q8k4h2hud2nrmc9m84b4ab/wirirililefik.pdfIn PDF document text
    • http://ourhkg.com/UPFILE/userfiles/files/guguvevufitexuviz.pdfIn PDF document text
    • https://advik.net/userfiles/file/52862745618.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/5cd3fa1490ea3bc872f636f6245da662/pedituzikela.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ad22ca7f618c68f22f5d623b060b086f/livaj.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/0f5d2235efe8e1a88aeddb2f0c8f4b2e/87372847618.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=17+stone+6+lbs+in+kgPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ead1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD1 16700 bytes
SHA-256: 8d9f52bd0d8f331db6b9b6039f5579ba5453fae5dc06e45adecdcd1310c2b153
font_01_sfnt_off00011634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11634 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E4B 10424 bytes
SHA-256: da988d72b7769068355787b821af6b378a010abba60ab96f64bbca1f7e0b0f37